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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe6fcf0a7a505a6a59274e92e9b6223df86fb2418b770e8580a285e72f32b39e' 
  AND token = 'H2kmHWlCGVcI6gk9WDb3URwosmJBO1ydRu2K7Nlmt6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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