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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03a35b33b9088767eb24e0de92f3741d6731b248f13a67e84e87e6d07b76a583' 
  AND token = 'vWf2chZ5dwgoCz3XoFjAr7mP4ltC1kIGbNFnpY7BWvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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