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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c2ee5b3eb6669f0093aed32d2b67c6c13af455340db0c7e2380af10ecd3226f' 
  AND token = 'rQEam7M5yTF22ME56qzaFIq7D7Go3u4TKt7nzBYs91w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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