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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc7ecfece74eeeb5e1bb77e1213614accae8251736f0aaef2889dc057db1ef6' 
  AND token = '1MbIE5zQwwSXCfx0Inj+8s+EMMYX6/xDWmjluKuQLPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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