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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d9ef88248cbe14696b68d0bc04ca20727dd4c585e25ed7a9552e7590eaa1e7' 
  AND token = 'u0noHplUym2v5RPXT6zh0Es6hmvc9lm7fb+Fgf+kEBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}