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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e6a8a2a89cc17877655c384c86d6af6a9651da55b0c905ad9966ee0cbc723d' 
  AND token = '+0rFVQIMKZtuhCBTODAhFTiQTa5UHu/Bv8/CoNQmdJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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