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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ffd4bce145af3ccddd2e1e19535149fa1c37d6684850dba7866dbc38df32e5' 
  AND token = 'yTwXKZGxF4tZ1dvbwVUaOomurqXtLJc2ODQ/caDCNe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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