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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2296976161c38a8ac48906640771d844636748f614b9bd7c755e072bf674a960' 
  AND token = 'id3BnHdM23sL6dvNIt2L7Rxk5lHl1Lltc0lNYY1eKkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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