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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47de6c5965b22aa4c93c178aa5c75dd1036aff736b3f582a316e1e70ecca16cc' 
  AND token = 'iKZGtMCayqVnHLKB2m7e5329+p7IiecaBCWGbpX735E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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