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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd32e7c3f109c3b9930909b40f83a39a50f9e933386085acea0573f33bc719a7' 
  AND token = 'feBrI5Zb2Hh4AOMeD/pU6hkhA5kAmV5rVGZZz/Xf90w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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