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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c076d533975dad5c3668363b31aff804a4681cd10cb66cba69d025383c6a3c41' 
  AND token = 'jUJUyZK7Be044u8gyw8tLNLGLhCyMB+GFNniO09HOww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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