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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2aa6d516d03df8ac8dc474252bb106b3a0db70d141c1f55d82c1add97fb2a5' 
  AND token = 'ciBejQ9Z5+eV37SD38yZo8e/e5a1/8+oHox/lQ2G6bI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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