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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1d3855fb024f36797967388d0c6b17008d5f3584b9ab3a9587e5c68da29970' 
  AND token = 'znNlHD2BgIqoHM0dVfHRRToofzEundwk/JgIgIAacOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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