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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '667a267c85fbf6afb88641bf9b0613e00b31ff379264a1f198badd263886225d' 
  AND token = 'WQTsSVYJIGHQcbj0nE8yoAF6h3G/KnaUlFXz37KDrEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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