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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '578a68493caef7e5f7bc490d5c057483f49739ba57cd129d941aa91c157ca52f' 
  AND token = 'f+oAT7LU5ocgkXMUwQEz1903WXvGoW46L+b+OeJrD4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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