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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f53a970a61c30cb88b2ef6efd3b69b11ff1491f1d329f60083d40d2e7d83c37' 
  AND token = 'spmar7pFNn3wdZ5x3asVteA5Yn5Bxk9VzduvoUN3zx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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