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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4dad27eecf8614fa32186ad5402fe65d798769ba16ab8efebe003543727098' 
  AND token = 'iBowHgT6VqH9d0pzLNqX8rLQ0RFUC1Z1tw5UiQZzG8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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