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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bd952689e99e8fd5b61d2eb3ae542f682f6ca8005d5893d2c53d7ddc23d1dc' 
  AND token = '2HV3uEEZK0kBah170gNto2e5MKUPsK2XbnLbyBT1GZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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