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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5414ffafc0986e776e885a8510c548f36434281936467a592a9bfccd27af44' 
  AND token = '54b+Ywnx+dwwaKuQg9EZ5inNCdkN+PgCrs317etlH1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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