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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac54a90b31e8087918cf8ea337731330db570266a2ebe2b3ed48ef8ce8ed0330' 
  AND token = 'VTT9L8X4duJudr5PTtd6IlGrnFNUOj9oYIbIGvS5w7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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