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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c229b7ca7f8a3cf7cd22babce962573a9dcfdb0dcbefe4fe432d9b7af37312a3' 
  AND token = 'iR3817gxW9q+cQ1pf3QLk01iBOLOIOTlas5ge1+1VFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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