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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ec586447cf734136da8e95ae91d79b25c56a023ec4af8aed21bf013b8d570d' 
  AND token = 'j0X38KQ77dVUjgRj0E0LPs4+5uG5beB5DlXVJ1w+WVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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