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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98535e1e68960780955ea4fc84c5a185566fb000493d4a497964584022cdcaba' 
  AND token = 'aAgc6gnBcTikJDOjb+B2LFjlh68lqwaSIS0VmJNc9KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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