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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705ff1c3f4b0dbe36bee3cb2600345508a4aa4cb9e84cce47a831ecc918047e9' 
  AND token = 'kq+LG0RtcZm9UjaGvB08lGWL6jNYS3UwsRavAWjM7Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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