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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f326901dc40a609142a79545b36445ff97d18c8a00df0bc1d5b6591e02516e9' 
  AND token = '2KUw1p5U2bUvL8QMk7Jp/qilhTCE4T0wAco/t96QlzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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