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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58700e0540ea53e0bb003806f1e2d0c264a622de342c6e66218c56e52a05fb3' 
  AND token = '1w8MjUqTFc61qvcvrXc0NZTfvULoPEpanwXyGcb8amw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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