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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1046b96c3b872700690609664b39a48c08dc86bb7071a475d5158f31e7b45544' 
  AND token = 'HaNbse9xCjIX7Bkh9+J2wn8SuC7uBve7p1BxlUuQ0L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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