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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba80cd07902ee7e93918e82ac8bffa4c35d0064341347041d847d5a4e191670' 
  AND token = 'lOy3WDfRe3nJzeGGiH6Q/6PBK2EnO6rgkca2lT8KCXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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