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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402cf656885d2d8ab5e1590dd4ecfbdfe0a007db90ca1f30844a57b9fe4aab38' 
  AND token = '3jCpMIrHsJYcp867KBVT/oN5zW+x1fh29WSaLEuVf5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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