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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f202d1a0008da12e0e5e26b3da8e3ce0ea4e54b343144eeb218abfb285226df' 
  AND token = 'Lfwa5zP1azDPyJ+nNLxrYPp91I5yOcnqXE+KtarRUYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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