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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e3f13d893cf4ebc7c11bf480b90f20ba9a1df579da07c18b3b8d6b15c32b89' 
  AND token = 'cYPvuLrdGwNVh6JvxWS7eqxicQ565o2CQGjf84sBt3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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