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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd1cba7a209128446a6292b4654504fbc0a26c7c54f756168dd693b7c26e6a8' 
  AND token = '6DaHlgScCazFKvyUkmZ3adpMCl/BILUH/lcGNGWUArU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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