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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6304e674af1b49624c34633701af2d1635d0cf2a6b5d11c3c6a16b985a2341e' 
  AND token = 'Y4eZB7ZArAYYiIIkNNePQdXEz9K51+UbsK2fzcqOgJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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