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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2767f663339ff97e3ac81d9ded31179bda9aaf1b0206dff6ceb5867803127ebf' 
  AND token = 'nUpnzKFDrbKipX/srUXn6wCmwxKysN8bKy77CY1cP0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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