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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c8295c29e9068c6ddd63ac80b39c586239904d9cd7b41f29a3d36ffefb3019' 
  AND token = 'Liv8JcU9mAFC/aaW7/uZ0Ecx+uXQhU6rc2Q8ROUtYXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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