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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e106198b5c5f7b3112234d0742fb98441adfb03bbbacc3d4b932d9df1f19e1' 
  AND token = 'sBrSRsnyx20tfx7bk3F1tIa/obnfMJvwFhzAP7Ug5Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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