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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50922df20725c86afd12052012c0814bf14943b8e664886cde8a122c2f9ff5d8' 
  AND token = 'K/TGImnSJNNAy+WA53mKM7tcwM2gYpRVA5I4ehO/4zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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