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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91bd8b165f080453e057d9a9f596bd78478752aeafdb612fae438c8d545a8987' 
  AND token = 'r/f7shvwklsQQBsJEyjRcyFam5SQkj87QxHVG092fxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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