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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af352635dcecf7ea02daf9471d2d8a1a049a6ec9141b7522f5681830e1a856f' 
  AND token = 'AFpa/ekrPo8Lb8AcvIz3rpZru1VKtgI2ZFa9yZbycl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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