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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a80f33e68d79d23daaf3c31d4c91721eb43f72a81ed58b5bcfb7223cb9d69e' 
  AND token = 'e+Eam+I+JCccRgm470+d+qrs6qCNFmLIzpdbUDLXvQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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