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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267c1aa7c67e4bd636fa502b52769b0aceba783b4cda8fbca3f6e5ef08600cab' 
  AND token = 'vqBYmBj1sZD7C9AWbEbF7WXOEXiGCLqT4BPQ6RahGlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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