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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e9050caed1404e92853f8a714486ca07f7b7c9a39e3cc1ea027b068c5701b95' 
  AND token = 'zgf3+SW1ls+GiBpeCD7IiLznenzWk+AKh2/svYRS70M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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