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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad381ed947c2feaa82bb9f8fe0e7b21ed64e0b69332acb9abc69f7b17a3f62f' 
  AND token = '3Ll4dwYS+ir6hyLukr1RC+w799IBmfpOXlNqnzRWvlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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