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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7e799b4b5e7a8d9e1daab79f17d01720d29edd363ae0d7f948543179263714' 
  AND token = 'hoopwt85303qP5NO6vCWxIYyqlSxqUvqjasEGo3O3jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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