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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81d413d990f1316b5d53bc7daea3c3da033970b8c564572e78f27ae29ed8384e' 
  AND token = 'WcV04iW/AS1SfMiY7Mp3qQHv2GJ0dr18NfkLfSG/XZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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