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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc6c30d75ca1f98871378b9a2225e2efc107864cd5f94a01b2aefcaa5cf9d6c' 
  AND token = 'OOkz8C0lKXK2eAmsTiKsZ9/T8ZtxnI9TBSIY6seTSnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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