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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c9131b7997e5f1be2e2a57c63c72b42dfeac4ec3f0c3abf7b7cf0ea2ed7885' 
  AND token = 'Y0ujUPHgdSexTbgr6FMsf3u+X28ou+jlSCJHUuzy1nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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