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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9fc00144fff41ef10e377a0f0421e81d1649d72d9f5e4badd38a212ba8440b' 
  AND token = 'Kl/UMsbSbZsVPOIjUKVZM4JiBrlxoKOP1PmlbISN62k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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