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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e805a556cd1c48dff0be821c422eb5393b4e159f556db1c51a4e16575d14892b' 
  AND token = '1NrddFW8hk4ww2Ac5rrDrwOHz2odNykR9Atq+7iKfRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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