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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3db27bd787e719266f8ee8a48bc0c28d7ab2fb5c4849848ec19f39a04d2b22fe' 
  AND token = 'MCQHr7NLUvGfTTFSNOVA6bfQXxGJPK+O5lutWRVA/M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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