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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33f8de093b3774fd3b78131edd7cbba59237943caf44f400688a53ff7f0eb578' 
  AND token = '5ax6eE31efhdeHVUpSbxe+/QacA9k6zVb/DGVIw2PZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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