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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4701b7e8857fc6f67ed1e83b3d2cb07b476e0d24717d22c548ff835974ff7941' 
  AND token = 'qVae++9IQh57AU+wNYr9nfX+UO4RH7xUqK07BLt4cvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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