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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25bba02965a03202607a01b3c57ef03e95f55f7a5d6f01033f0d723db81ad57' 
  AND token = '9+pWrFQlKj31nbsJqSYUVprnPEsVbPKJL5hnvWkfWPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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