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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c42352a6bcd35fd6c5adcc34b271b667f91e2aa59a10b6dc3ec8ef52ee94a4' 
  AND token = 'ZSen4wzz22KZ+KxlbsUtiWYKiXDlQ/XyWl58zzrF1WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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