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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599d3c573f7a680344054dc57081b6d74d03be9ae4eb3cb86a58f9eec1530a3a' 
  AND token = 'Jr2g02EbpTRzF0XGdMoH/fQ9ctVbuqx8vtB6aydzn54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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