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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1699f42ac96d05f099b92ef04b5b3f5ff082d56ac7c5a43110017038d0cfed83' 
  AND token = '4sG1Jdd6egngzrVhNxacF8GzD3uqoPKx4rHqLT5m6XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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