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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e71abba9e30222223d0f1ec0874c5bea4488e9db4a9019436a06e4034ab88e46' 
  AND token = 'NsGoX9hmK/IHdPrMWSl4851J8+ROqs4tAQnoDLXA630=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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