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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70229f73de8912c433b12eb0fd6622a81ace7749d5a293f7f15fb7b334931d7' 
  AND token = 'xdjCQPyWOnVt9fPybJoEFCy4chiezGQr6rVfn/6Mmkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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