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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf69018c1337b15fc5304c8d4791d10712b42a31db4d716d87693f482b2d158e' 
  AND token = 'CN9ymGMHMiJjCLq3BojejRi1alatvuQ/xYMxqQBAx0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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