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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d77cb611ce613c550f88d6aa481cb3e216548404c0be90982ca5d6449158b9' 
  AND token = 'eMujOyhzTrPbauWo8xA07ZW2xuzayjwo6R592v4drxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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