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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f409c3257e39b804c26ff1a4540e698e19432350052101d6efb232cc9227c5' 
  AND token = 'APV+i4NOJS+xpoTi1mhfUStlC3XWXLRp+dks1tV25V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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