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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd151d13bbee58ed2ea951e128ed0ff4c63b1d38521ea79bc0ad1a251ea2e3c' 
  AND token = 'gCvpUiHIja3udwe4HK7p6hvIFXBK/1Oh62p6LjkMv8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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