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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11e19886bdb9b2a1a231c5ea358d465061fa590af6a0e38c251d7aefe4828b2' 
  AND token = '9bdbckBWUIxeqOJ4049m+SKbekoGAwwkWYXTzeU4nLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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