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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0310eb4b43c3a06c6d6478fb00fdfd35ac02dda74ad5e68f0d59405cd26768cf' 
  AND token = 'N5DVOQvyDXCwMW9QF4p9UQQdUXWaM34kCjvnvK94Rwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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