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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f747abbee500ebec05437d336eeaf6ae05fd2ce56d150cdb33e000e5f04d699a' 
  AND token = 'tggyLasZNo+UbK72SNWw7T8UvL4t+Is//6jH8/EJPuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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