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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd002d338745416ef5e9daf04dcd34559181ae8b191c61a23268e7d86bb68ffb' 
  AND token = '1xn1V8H1TQlWWCZyh+aaxFe4QnD2qqrjp2zVwaCDehY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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