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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191dfa2d36e3facf9f92b362fb78284237b7edbcb239cca660c771183319c9b6' 
  AND token = 'rqVnGOqxAqdFuZstYH86lDpHdk5ZIHXXT1EtC7uABr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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