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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c2bed7972d5d30c60d857d95bbf006c0451066a3204db30f23a7fe911cabda1' 
  AND token = 'sX85gzdst77LOBgcx6ZBujMjOiM3frM69lLaqbKO0GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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