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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ac67ab37418c28baa5528746ce9a526c13b0b0546d834fd8222b085249ebdbf' 
  AND token = 'EzcxVvayFliu4x7vXoeJVez5VRO64wkQtzt6lNdTxDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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